Just came back from Geek Squad and installing a powered (Bazooka) subwoofer was a no go. Something about not strong enough of signal from the back speakers to move the woofer. Tried to install a back up sensor and also a no go unless he drilled some holes on the sheet metal. No thank you. The only thing I was able to do was change the rear speakers and the difference wasn't that great. The current speakers are pretty good quality. Crap.